Journal
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
Volume 18, Issue 1, Pages 26-34Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.cocis.2013.01.001
Keywords
Zwitterionic surfactants; Nanoparticles; Chameleon effect; Ion binding; Catalysis
Categories
Funding
- INCT-Catalise
- CNPq
- CAPES
- FAPESC
- PRONEX
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Zwitterionic surfactants are relatively overlooked and some of their properties resemble those of ionic and non-ionic surfactants, but others are unique. There is unimpeachable evidence that aqueous solutions of zwitterionic micelles interact specifically with anions, forming anionoid micelles, which concentrate cations in the surfaces. Thus, unlike ionic micelles, both the cation and anion of the electrolyte solution can be concentrated at zwitterionic interfaces. This unique effect, known as the Chameleon Effect, can be used to catalyze a variety of simple reactions, as the attraction of ions to the micelle brings the reactants together. Furthermore, zwitterionic surfactants stabilize metallic nanoparticles and the magnetically stirred two-phase system could be reused 3 more times in the hydrogenation of cyclohexene (Pd:cyclohexene ratio of 1:18300), with very little loss in activity, and an average turn-over frequency of 1000 h(-1). (C) 2013 Elsevier Ltd. All rights reserved.
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